Fix excluded modules for docs

docs/autogen_api.py

@@ -34,7 +34,7 b" if __name__ == '__main__':"
                                         # This just prints a deprecation msg:
                                         r'\.frontend$',
                                         # Deprecated:
-                                        r'\.core\.magics\.deprecated'
+                                        r'\.core\.magics\.deprecated',
                                         # We document this manually.
                                         r'\.utils\.py3compat',
                                         # These are exposed by nbformat.current